it sort of depends what look you are going for.
if you want a classic ground pounder look the rally's, a slotted mag, or a TTd woudl be great looks in a 15inch rim.
if you wanna get more of the modern street machine with upsized rims look there are tons of options. weld rod lites(i am lookin at these for my 76) can be had in 15-18inch sizes i believe, or the billet specialties "vintec" and "vintec dish" series wheels(really stylie wheels, just too heavy for my racin gblood
)) would look good.
give me a clearer idea what style you are after and i can find you examples of wheels to check out.